Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.67-2.733.1-3.2
1
7.18
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Fracture
Conchoidal
-
Cleavage
Perfect on [10 1 1] three directions with angle of 74° 55
Vitreous, pearly on cleavage
Mohs Hardness
33-4
2
10
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Chemical Composition
CaCO 3Ulrich Henn and Claudio C.
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references